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[[image:{{{wibwobx}}} Wibble Wobble.PNG|40px|center|link=]] Headasteam
暴走マッタナ氏, Bōsō Mattana-shi
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{{{form name 1}}} {{{form name 2}}}
Attribute Rank
Fire icon
Time Type
Yo-kai Watch 2
Side-games number
Headasteam is not numbered.
Skill Effect
Favorite food
Headasteam has no favorite food.
Side-game favorite food
Headasteam has no favorite food.
Base Stats
Total: 0
Stats of Headasteam is unknown.

Headasteam (Japanese: 暴走マッタナ氏 Bōsō Mattana-shi) is a Boss Yo-kai which appears in Yo-kai Watch 2: Psychic Specters. He is fought in the Hexpress engine room.


Headasteam is a large Yo-kai whose body is mostly compossed by his head, gray in color, with the mouth area colored red; sporting four large fangs inside the mouth. He has three eyes: a green eye in his front, and two uneven eyes resembling pressure meters, the left one being larger and more detailed -with scale-like markings rounding it-. He has comparatively shorter and smaller arms with gloved hands. He sports a driver's hat, alluding to his position in the Hexpress.

Headasteam appears to have a very short temper.

He has enough energy to keep the Hexpress running, being connected to the engine system.


In this boss battle, each blow Headasteam receives fills a two-fold red bar in the left side of the background and a blue bar in the right side of the background. Pinning the valves in said side causes each of the bars to fill faster.


Headasteam appears at the engine room of the Yokai Hexpress.


  • ""Boso" describes the following: "running wildly; reckless driving; runaway; rampage".
  • Headasteam is based on the idiom "a head of steam", which describes a situation in which a person or an activity starts to become very active or successful.
  • Chomino comes from "Chaud" (hot) and "Cheminot" (railroader)

In other languagers

Language Name Meaning
Flag of Japan Japanese 暴走マッタナ氏 Bōsō Mattana-shi
Flag of France French Chominot
Flag of Spain Spanish Expresso
Flag of Germany German Stresskessel
Flag of Italy Italian Vaporix